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In which one of the following cases is the t-statistic the appropriate one to use in the construction of a confidence interval for the population mean? A. The distribution is normal, the population variance is known, and the sample size is less than 30. B. The distribution is nonnormal, the population variance is unknown, and the sample size is at least 30. C. The distribution is nonnormal, the population variance is known, and the sample size is at least 30. |